How to wrap facet?

[lucharo]

Hi, I quite like altair's facet interface (as explained here), the only thing that I am looking for that I cannot find is a way to wrap my facet, in ggplot style? I am faceting by a single column with 4 distinct categories and I'd like to see a 2x2 grid instead of a row/column with 4 items

[lucharo]

Nevermind, found it:

alt.Chart(df).mark_line().encode(
    x = "date",
    y = "amount",
    color = "category",
).properties(
    height = 400, 
    width = 500, 
).facet(
    'group:N',
    columns = 2 # <--- this one
)

I was simply using the the concise notation, e.g. :

alt.Chart(iris).mark_point().encode(
    x='petalLength:Q',
    y='petalWidth:Q',
    color='species:N',
    column='species:N'
).properties(
    width=180,
    height=180
)